...and please, PLEASE ... Don't call it gravy! I know different people call it different thing but for me, gravy is what you put on your turkey at Thanksgiving and sauce is what you put on your pasta. I cringe when I hear it tomato sauce called gravy. But hey, to each is own!
Also, I know everyone puts different thing in their...I recently went to a friend's house and he had fennel frawns in his sauce (and it was very good)... I like my sauce simple and other like to make it more complicated.
I'm in the process of figuring out my own version... but I'd like to hear how you make yours.